from django.contrib.auth import get_user_model
from django.db import models, transaction
from django.urls import reverse

from tickets.models.ticket_list import TicketList
from ..lib.tickets import Ticket as T

class Ticket(models.Model):
    TICKET_TYPES = T.TICKET_TYPES
    TICKET_STATUSES_NAMES = T.TICKET_STATUSES_NAMES
    TICKET_TYPES_CHOICES = T.TICKET_TYPES_CHOICES
    LIFE_CYCLE_DICT = T.LIFE_CYCLE_DICT

    title = models.CharField(max_length=128)
    ticket_list = models.ForeignKey(TicketList, on_delete=models.CASCADE)
    ticket_type = models.PositiveSmallIntegerField(choices=TICKET_TYPES_CHOICES, default=1)
    status = models.PositiveSmallIntegerField(null=True)
    created_at = models.DateTimeField(auto_now_add=True, editable=False)
    updated_at = models.DateTimeField(auto_now=True)
    due_date = models.DateField()
    created_by = models.ForeignKey(
        get_user_model(),
        on_delete=models.SET_NULL,
        null=True,
        related_name="created_by",
        editable=False
    )
    assigned_to = models.ForeignKey(
        get_user_model(),
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="assigned_to"
    )
    note = models.TextField(blank=True, null=True)
    json = models.TextField(blank=True, null=True)
    priority = models.PositiveSmallIntegerField(default=0)

    def __str__(self):
        return self.title

    def _get_statuses(self) -> list:
        return self.LIFE_CYCLE_DICT.get(self.ticket_type)

    def get_available_statuses(self) -> list:
        for status_scenario in self._get_statuses():
            if status_scenario[0] == int(self.status):
                return status_scenario[1:] if len(status_scenario) > 1 else None

    def set_first_status(self):
        self.status = self._get_statuses()[0][0]

    def get_status_display(self):
        return self.TICKET_STATUSES_NAMES.get(self.status)

    def archive(self):
        """
        Архивирует текущий тикет.
        
        Создает новую запись в TicketArchive с информацией текущего тикета,
        а затем удаляет текущий тикет из базы данных.
        """
        with transaction.atomic():
            # Создаем новую запись в TicketArhive, сохраняя значения всех полей
            TicketArchive.objects.create(
                title=self.title,
                ticket_list=self.ticket_list,
                ticket_type=self.ticket_type,
                status=self.status,
                created_at=self.created_at,
                due_date=self.due_date,
                created_by=self.created_by,
                assigned_to=self.assigned_to,
                note=self.note
            )
            # Удаляем текущий тикет
            self.delete()

    def save(self, *args, **kwargs):
        if not self.status:
            self.set_first_status()

        super(Ticket, self).save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse("tickets:ticket_detail", kwargs={"ticket_id": self.pk})

    class Meta:
        ordering = ["-priority", "created_at"]


class TicketArchive(models.Model):
    title = models.CharField(max_length=128, editable=False)
    ticket_list = models.ForeignKey(TicketList, on_delete=models.CASCADE, editable=False)
    ticket_type = models.PositiveSmallIntegerField(choices=Ticket.TICKET_TYPES_CHOICES, editable=False)
    status = models.PositiveSmallIntegerField(editable=False)
    created_at = models.DateTimeField(editable=False)
    updated_at = models.DateTimeField(auto_now_add=True, editable=False)
    due_date = models.DateField(editable=False)
    created_by = models.ForeignKey(
        get_user_model(),
        on_delete=models.SET_NULL,
        null=True,
        related_name="ticket_archive_created_by",
        editable=False
    )
    assigned_to = models.ForeignKey(
        get_user_model(),
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="ticket_archive_assigned_to",
        editable=False
    )
    note = models.TextField(blank=True, null=True, editable=False)

    def get_status_display(self):
        return Ticket.TICKET_STATUSES_NAMES.get(self.status)